%0 Journal Article %T On the utility of Robinson-Amitsur ultrafilters %A Pasha Zusmanovich %J Mathematics %D 2009 %I arXiv %R 10.1016/j.jalgebra.2013.04.024 %X An embedding theorem for algebraic systems is presented, basing on a certain old ultrafilter construction. As an application, we outline alternative proofs of some results from the theory of PI algebras, and establish some properties of Tarski's monsters. %U http://arxiv.org/abs/0911.5414v7